From: Alan Tull <delicious.quinoa@gmail.com>
To: Olof Johansson <olof@lixom.net>
Cc: Sebastian Andrzej Siewior <bigeasy@linutronix.de>,
Alan Tull <atull@altera.com>, LinusW <linus.walleij@linaro.org>,
Alexandre Courbot <gnurou@gmail.com>,
"linux-gpio@vger.kernel.org" <linux-gpio@vger.kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Dinh Nguyen <dinguyen@altera.com>,
"devicetree@vger.kernel.org" <devicetree@vger.kernel.org>
Subject: Re: [PATCH 1/7] ARM: dts: socfpga: add gpio pieces
Date: Tue, 6 May 2014 10:01:11 -0500 [thread overview]
Message-ID: <CANk1AXQXWrsgbypTFENFf+X9yhE2t967icK0=3WAvxCPwsXFYA@mail.gmail.com> (raw)
In-Reply-To: <CAOesGMi_0fT4UbfGUp9jkrwYMXgfxC5gmXOBviU9PjAutPdHiw@mail.gmail.com>
On Mon, May 5, 2014 at 5:02 PM, Olof Johansson <olof@lixom.net> wrote:
> Hi,
>
> I saw this patch as it came in through Dinh's pull request, see below:
>
>
> On Sat, Mar 22, 2014 at 9:16 AM, Sebastian Andrzej Siewior
> <bigeasy@linutronix.de> wrote:
>> The cycloneV has three gpio controllers, the first two with 29 gpios, the last
>> one with 27. This patch adds the three controller with the gpio driver which is
>> now sitting the gpio tree.
>>
>> Cc: devicetree@vger.kernel.org
>> Acked-by: Alan Tull <atull@altera.com>
>> Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
>> ---
>> v1…v2:
>> - #gpio-cells = <2>
>> - third gpio block has now only 27 gpios
>>
>> arch/arm/boot/dts/socfpga.dtsi | 64 ++++++++++++++++++++++++++++++++++++++++++
>> 1 file changed, 64 insertions(+)
>>
>> diff --git a/arch/arm/boot/dts/socfpga.dtsi b/arch/arm/boot/dts/socfpga.dtsi
>> index 537f1a5..2a84e67 100644
>> --- a/arch/arm/boot/dts/socfpga.dtsi
>> +++ b/arch/arm/boot/dts/socfpga.dtsi
>> @@ -463,6 +463,70 @@
>> status = "disabled";
>> };
>>
>> + gpio@ff708000 {
>> + #address-cells = <1>;
>> + #size-cells = <0>;
>> + compatible = "snps,dw-apb-gpio";
>> + reg = <0xff708000 0x1000>;
>> + clocks = <&per_base_clk>;
>> + status = "disabled";
>> +
>> + gpio0: gpio-controller@0 {
>> + compatible = "snps,dw-apb-gpio-port";
>> + gpio-controller;
>> + #gpio-cells = <2>;
>> + snps,nr-gpios = <29>;
>> + reg = <0>;
>> + interrupt-controller;
>> + #interrupt-cells = <2>;
>> + interrupts = <0 164 4>;
>> + };
>> + };
>
> This is an odd setup. We usually would have it all in one node, since
> the @ff708000 is the GPIO controller, instead of adding a subnode with
> the actual GPIO info.
>
> So I would have expected something more like:
>
>
> gpio0: gpio-controller@ff708000 {
> #address-cells = <1>;
> #size-cells = <0>;
> compatible = "snps,dw-apb-gpio";
> reg = <0xff708000 0x1000>;
> interrupts = <0 164 4>;
> clocks = <&per_base_clk>;
> status = "disabled";
> gpio-controller;
> #gpio-cells = <2>;
> snps,nr-gpios = <29>;
> interrupt-controller;
> #interrupt-cells = <2>;
> };
>
>
> ... or is there some underlying reason for having the two-layer
> approach that isn't obvious from this device tree?
>
>
> -Olof
The synopsys gpio ip can have 1, 2, or 3 gpio ports of varying widths
per IP block. The simpler bindings assume one gpio port per IP block.
Alan Tull
aka
delicious quinoa
next prev parent reply other threads:[~2014-05-06 15:01 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-03-22 16:16 dwapb: a bug fix a few cleanups, v2 Sebastian Andrzej Siewior
2014-03-22 16:16 ` [PATCH 1/7] ARM: dts: socfpga: add gpio pieces Sebastian Andrzej Siewior
2014-05-05 22:02 ` Olof Johansson
2014-05-06 15:01 ` Alan Tull [this message]
2014-05-13 8:45 ` Linus Walleij
2014-03-22 16:16 ` [PATCH 2/7] gpio: dwapb: correct gpio-cells in binding document Sebastian Andrzej Siewior
2014-03-25 20:49 ` Linus Walleij
2014-03-25 20:57 ` Sebastian Andrzej Siewior
2014-03-25 21:00 ` Linus Walleij
2014-03-22 16:16 ` [PATCH 3/7] gpio: dwapb: drop irq_setup_generic_chip() Sebastian Andrzej Siewior
2014-03-22 16:16 ` [PATCH 4/7] gpio: dwapb: use irq_linear_revmap() for the faster lookup Sebastian Andrzej Siewior
2014-03-22 16:16 ` [PATCH 5/7] gpio: dwapb: use irq_gc_lock() for locking instead bc's lock Sebastian Andrzej Siewior
2014-03-22 16:16 ` [PATCH 6/7] gpio: dwapb: use a second irq chip Sebastian Andrzej Siewior
2014-03-25 18:48 ` delicious quinoa
2014-03-25 19:40 ` Sebastian Andrzej Siewior
2014-03-25 21:36 ` Sebastian Hesselbarth
2014-04-07 9:59 ` Sebastian Andrzej Siewior
2014-04-08 15:11 ` delicious quinoa
2014-04-30 11:13 ` [PATCH 6/7 v2] " Sebastian Andrzej Siewior
2014-05-09 11:46 ` Linus Walleij
2014-05-13 16:17 ` Alan Tull
2014-05-16 15:01 ` Linus Walleij
2014-05-22 9:42 ` Sebastian Andrzej Siewior
2014-05-22 14:08 ` Alan Tull
2014-05-26 21:02 ` Sebastian Andrzej Siewior
2014-05-26 20:58 ` [PATCH v3] " Sebastian Andrzej Siewior
2014-05-27 9:55 ` Jamie Iles
2014-05-27 14:21 ` Linus Walleij
2014-05-27 16:30 ` Sebastian Andrzej Siewior
2014-05-28 9:01 ` Linus Walleij
2014-05-28 9:26 ` Sebastian Andrzej Siewior
2014-03-22 16:16 ` [PATCH 7/7] gpio: dwapb: use d->mask instead od BIT(bit) Sebastian Andrzej Siewior
2014-03-25 2:17 ` Alexandre Courbot
2014-03-25 7:54 ` Sebastian Andrzej Siewior
2014-03-25 21:18 ` [PATCH 7/7 v2] " Sebastian Andrzej Siewior
2014-03-25 21:25 ` Joe Perches
2014-03-25 20:45 ` dwapb: a bug fix a few cleanups, v2 Linus Walleij
2014-03-25 21:26 ` Sebastian Hesselbarth
2014-03-25 21:39 ` Sebastian Hesselbarth
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